﻿using Newtonsoft.Json;
using Newtonsoft.Json.Serialization;
using System.Reflection;

namespace Infrastructure.WebApi
{
    /// <summary>
    /// 小驼峰，StringNullToEmpty
    /// </summary>
    public class HandleStringNullToEmptyContractResolver : CamelCasePropertyNamesContractResolver
    {
        protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)
        {
            return type.GetProperties()
                    .Select(p =>
                    {
                        var jp = base.CreateProperty(p, memberSerialization);
                        jp.ValueProvider = new NullToEmptyStringValueProvider(p);
                        return jp;
                    }).ToList();
        }
    }
    public class NullToEmptyStringValueProvider : IValueProvider
    {
        PropertyInfo _MemberInfo;
        public NullToEmptyStringValueProvider(PropertyInfo memberInfo)
        {
            _MemberInfo = memberInfo;
        }
        public object GetValue(object target)
        {
            object result = _MemberInfo.GetValue(target);
            if (_MemberInfo.PropertyType == typeof(string) && result == null) result = "";
            return result;

        }
        public void SetValue(object target, object value)
        {
            _MemberInfo.SetValue(target, value);
        }
    }
}
